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Subject:	Re: conf coating used for potting
From:	Phil Crepeau <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Fri, 28 Apr 2000 08:50:18 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (51 lines)

hi,

'normal' conformal coatings are applied in nominal thicknesses of 3 mils.  at this thickness, the coating pulls away from sharp edges, corners and points exposing them to the environment.  when this is intolerable, you have a couple of choices.  one is to goop the coating on thicker.  the other is to use parylene.  you are witnessing the problem of the former.  the problem of the latter is cost.

phil

-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Friday, April 28, 2000 8:14 AM
To: [log in to unmask]
Subject: [TN] conf coating used for potting

What are the ramifications/advisability  of applying an acrylic conf coating
to a thickness of 20 mils over an assembly.  The various components have this
coating under as well as over the components so that it appears "potted"
instead of coated.

During temp cycling the solder joints on surface mount are popping.

Susan Mansilla
Robisan Lab

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